Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cab8d236563422…

MALICIOUS

PDF

45.6 KB Created: 2020-08-30 08:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d85fe03474f88b33fc218b7b9962184f SHA-1: 761c3ce05f542fbb7e77e1ab8ace381aa4e7d416 SHA-256: 77cab8d236563422ebf05f100026bb5b3c1f0d1b7042e26a8f5a1f0fd1007fc9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains text fragments that appear to be part of a lure, including 'first prize baldi's basics'. The presence of numerous embedded URLs, many hosted on 'static.usrfiles.com', suggests a link farm or redirection strategy. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=first+prize+baldi%2527s+basics
    • https://static.usrfiles.com/ugd/b8c837_0d2c8329fb094d4db01d7011dc740726.pdf
    • https://static.usrfiles.com/ugd/d5415a_0de8da1de21b4076b76dea7d3d61387d.pdf
    • https://static.usrfiles.com/ugd/a382ee_e32144656d3d4ec89c6d278681ef490e.pdf
    • https://cdn.shopify.com/s/files/1/0430/7002/9975/files/richard_bandler_libros_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9076/files/lagimasagaduli.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3434/files/46612508176.pdf
    • https://static.usrfiles.com/ugd/b8c837_d307585f8fdc43e7ab79e7c39acc6d58.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_1e6aa389917748128ade646dbb6125eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a137896d67c4e77980d30d20b4a3800.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c34b226dfc8471f97b5ecd5984c7e33.pdf
    • https://static.usrfiles.com/ugd/b8c837_db717865b5ba41c1bcb094b2cef30467.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000736d.bin
8be017ec6e4cfb696fa612f45fd489abf987320d5836b4ba7890bc47ffc22396		 pdf-font-stream PDF embedded font (sfnt) at offset 0x736D 5248 bytes
font_01_sfnt_off00008552.bin
80a2463b49c134bf2df2e7147f991a53565e0fd2a7065a64c5b36ac01209ef37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8552 10696 bytes

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